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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466f95dc96da8765a3e84034404ae24a82371a261c5272cda40c1799c6969323' 
  AND token = 'M0huoO/+sdE5TuQhC3OLqaYfIdgMMOjJU3jei+VQMRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}